Industry-high employee retention levels and executives holding their posts for decades are apparently going to be significant hurdles for incoming Apple CEO John Ternus . There's been a trend in tech reporting that attempts to make every employment change from the top down a calamitous occasion. Whether it's a dozen engineers out of thousands leaving or executives being poached with insane pay packages, every departure is treated as a serious problem. I'm still not entirely sure why. The latest report from Bloomberg doubles down on a seemingly incorrect rumor of Johny Srouji seeking to join a different company in order to prop up other similar rumors. It's an odd example to rely upon considering it was only hours before Srouji firmly squashed the rumor. To reiterate the absolute absurdity of it all, the original rumor was that 61-year-old Apple SVP Johny Srouji was going to go to a new company. Not retire, but leave Apple for somewhere else.…